Index: src/gpu/gl/GrGLSLBlend.cpp |
diff --git a/src/gpu/gl/GrGLSLBlend.cpp b/src/gpu/gl/GrGLSLBlend.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b6224e82306a3bc4964dcd4b225395383cdd7476 |
--- /dev/null |
+++ b/src/gpu/gl/GrGLSLBlend.cpp |
@@ -0,0 +1,435 @@ |
+/* |
+ * Copyright 2015 Google Inc. |
+ * |
+ * Use of this source code is governed by a BSD-style license that can be |
+ * found in the LICENSE file. |
+ */ |
+#include "GrGLSLBlend.h" |
+#include "gl/builders/GrGLFragmentShaderBuilder.h" |
+ |
+////////////////////////////////////////////////////////////////////////////// |
+// Advanced (non-coeff) blend helpers |
+////////////////////////////////////////////////////////////////////////////// |
+ |
+static void hard_light(GrGLFragmentBuilder* fsBuilder, |
+ const char* final, |
+ const char* src, |
+ const char* dst) { |
+ static const char kComponents[] = { 'r', 'g', 'b' }; |
+ for (size_t i = 0; i < SK_ARRAY_COUNT(kComponents); ++i) { |
+ char component = kComponents[i]; |
+ fsBuilder->codeAppendf("if (2.0 * %s.%c <= %s.a) {", src, component, src); |
+ fsBuilder->codeAppendf("%s.%c = 2.0 * %s.%c * %s.%c;", |
+ final, component, src, component, dst, component); |
+ fsBuilder->codeAppend("} else {"); |
+ fsBuilder->codeAppendf("%s.%c = %s.a * %s.a - 2.0 * (%s.a - %s.%c) * (%s.a - %s.%c);", |
+ final, component, src, dst, dst, dst, component, src, src, |
+ component); |
+ fsBuilder->codeAppend("}"); |
+ } |
+ fsBuilder->codeAppendf("%s.rgb += %s.rgb * (1.0 - %s.a) + %s.rgb * (1.0 - %s.a);", |
+ final, src, dst, dst, src); |
+} |
+ |
+// Does one component of color-dodge |
+static void color_dodge_component(GrGLFragmentBuilder* fsBuilder, |
+ const char* final, |
+ const char* src, |
+ const char* dst, |
+ const char component) { |
+ fsBuilder->codeAppendf("if (0.0 == %s.%c) {", dst, component); |
+ fsBuilder->codeAppendf("%s.%c = %s.%c * (1.0 - %s.a);", |
+ final, component, src, component, dst); |
+ fsBuilder->codeAppend("} else {"); |
+ fsBuilder->codeAppendf("float d = %s.a - %s.%c;", src, src, component); |
+ fsBuilder->codeAppend("if (0.0 == d) {"); |
+ fsBuilder->codeAppendf("%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);", |
+ final, component, src, dst, src, component, dst, dst, component, |
+ src); |
+ fsBuilder->codeAppend("} else {"); |
+ fsBuilder->codeAppendf("d = min(%s.a, %s.%c * %s.a / d);", |
+ dst, dst, component, src); |
+ fsBuilder->codeAppendf("%s.%c = d * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);", |
+ final, component, src, src, component, dst, dst, component, src); |
+ fsBuilder->codeAppend("}"); |
+ fsBuilder->codeAppend("}"); |
+} |
+ |
+// Does one component of color-burn |
+static void color_burn_component(GrGLFragmentBuilder* fsBuilder, |
+ const char* final, |
+ const char* src, |
+ const char* dst, |
+ const char component) { |
+ fsBuilder->codeAppendf("if (%s.a == %s.%c) {", dst, dst, component); |
+ fsBuilder->codeAppendf("%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);", |
+ final, component, src, dst, src, component, dst, dst, component, |
+ src); |
+ fsBuilder->codeAppendf("} else if (0.0 == %s.%c) {", src, component); |
+ fsBuilder->codeAppendf("%s.%c = %s.%c * (1.0 - %s.a);", |
+ final, component, dst, component, src); |
+ fsBuilder->codeAppend("} else {"); |
+ fsBuilder->codeAppendf("float d = max(0.0, %s.a - (%s.a - %s.%c) * %s.a / %s.%c);", |
+ dst, dst, dst, component, src, src, component); |
+ fsBuilder->codeAppendf("%s.%c = %s.a * d + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);", |
+ final, component, src, src, component, dst, dst, component, src); |
+ fsBuilder->codeAppend("}"); |
+} |
+ |
+// Does one component of soft-light. Caller should have already checked that dst alpha > 0. |
+static void soft_light_component_pos_dst_alpha(GrGLFragmentBuilder* fsBuilder, |
+ const char* final, |
+ const char* src, |
+ const char* dst, |
+ const char component) { |
+ // if (2S < Sa) |
+ fsBuilder->codeAppendf("if (2.0 * %s.%c <= %s.a) {", src, component, src); |
+ // (D^2 (Sa-2 S))/Da+(1-Da) S+D (-Sa+2 S+1) |
+ fsBuilder->codeAppendf("%s.%c = (%s.%c*%s.%c*(%s.a - 2.0*%s.%c)) / %s.a +" |
+ "(1.0 - %s.a) * %s.%c + %s.%c*(-%s.a + 2.0*%s.%c + 1.0);", |
+ final, component, dst, component, dst, component, src, src, |
+ component, dst, dst, src, component, dst, component, src, src, |
+ component); |
+ // else if (4D < Da) |
+ fsBuilder->codeAppendf("} else if (4.0 * %s.%c <= %s.a) {", |
+ dst, component, dst); |
+ fsBuilder->codeAppendf("float DSqd = %s.%c * %s.%c;", |
+ dst, component, dst, component); |
+ fsBuilder->codeAppendf("float DCub = DSqd * %s.%c;", dst, component); |
+ fsBuilder->codeAppendf("float DaSqd = %s.a * %s.a;", dst, dst); |
+ fsBuilder->codeAppendf("float DaCub = DaSqd * %s.a;", dst); |
+ // (Da^3 (-S)+Da^2 (S-D (3 Sa-6 S-1))+12 Da D^2 (Sa-2 S)-16 D^3 (Sa-2 S))/Da^2 |
+ fsBuilder->codeAppendf("%s.%c =" |
+ "(DaSqd*(%s.%c - %s.%c * (3.0*%s.a - 6.0*%s.%c - 1.0)) +" |
+ " 12.0*%s.a*DSqd*(%s.a - 2.0*%s.%c) - 16.0*DCub * (%s.a - 2.0*%s.%c) -" |
+ " DaCub*%s.%c) / DaSqd;", |
+ final, component, src, component, dst, component, |
+ src, src, component, dst, src, src, component, src, src, |
+ component, src, component); |
+ fsBuilder->codeAppendf("} else {"); |
+ // -sqrt(Da * D) (Sa-2 S)-Da S+D (Sa-2 S+1)+S |
+ fsBuilder->codeAppendf("%s.%c = %s.%c*(%s.a - 2.0*%s.%c + 1.0) + %s.%c -" |
+ " sqrt(%s.a*%s.%c)*(%s.a - 2.0*%s.%c) - %s.a*%s.%c;", |
+ final, component, dst, component, src, src, component, src, component, |
+ dst, dst, component, src, src, component, dst, src, component); |
+ fsBuilder->codeAppendf("}"); |
+} |
+ |
+// Adds a function that takes two colors and an alpha as input. It produces a color with the |
+// hue and saturation of the first color, the luminosity of the second color, and the input |
+// alpha. It has this signature: |
+// vec3 set_luminance(vec3 hueSatColor, float alpha, vec3 lumColor). |
+static void add_lum_function(GrGLFragmentBuilder* fsBuilder, SkString* setLumFunction) { |
+ // Emit a helper that gets the luminance of a color. |
+ SkString getFunction; |
+ GrGLShaderVar getLumArgs[] = { |
+ GrGLShaderVar("color", kVec3f_GrSLType), |
+ }; |
+ SkString getLumBody("return dot(vec3(0.3, 0.59, 0.11), color);"); |
+ fsBuilder->emitFunction(kFloat_GrSLType, |
+ "luminance", |
+ SK_ARRAY_COUNT(getLumArgs), getLumArgs, |
+ getLumBody.c_str(), |
+ &getFunction); |
+ |
+ // Emit the set luminance function. |
+ GrGLShaderVar setLumArgs[] = { |
+ GrGLShaderVar("hueSat", kVec3f_GrSLType), |
+ GrGLShaderVar("alpha", kFloat_GrSLType), |
+ GrGLShaderVar("lumColor", kVec3f_GrSLType), |
+ }; |
+ SkString setLumBody; |
+ setLumBody.printf("float diff = %s(lumColor - hueSat);", getFunction.c_str()); |
+ setLumBody.append("vec3 outColor = hueSat + diff;"); |
+ setLumBody.appendf("float outLum = %s(outColor);", getFunction.c_str()); |
+ setLumBody.append("float minComp = min(min(outColor.r, outColor.g), outColor.b);" |
+ "float maxComp = max(max(outColor.r, outColor.g), outColor.b);" |
+ "if (minComp < 0.0 && outLum != minComp) {" |
+ "outColor = outLum + ((outColor - vec3(outLum, outLum, outLum)) * outLum) /" |
+ "(outLum - minComp);" |
+ "}" |
+ "if (maxComp > alpha && maxComp != outLum) {" |
+ "outColor = outLum +" |
+ "((outColor - vec3(outLum, outLum, outLum)) * (alpha - outLum)) /" |
+ "(maxComp - outLum);" |
+ "}" |
+ "return outColor;"); |
+ fsBuilder->emitFunction(kVec3f_GrSLType, |
+ "set_luminance", |
+ SK_ARRAY_COUNT(setLumArgs), setLumArgs, |
+ setLumBody.c_str(), |
+ setLumFunction); |
+} |
+ |
+// Adds a function that creates a color with the hue and luminosity of one input color and |
+// the saturation of another color. It will have this signature: |
+// float set_saturation(vec3 hueLumColor, vec3 satColor) |
+static void add_sat_function(GrGLFragmentBuilder* fsBuilder, SkString* setSatFunction) { |
+ // Emit a helper that gets the saturation of a color |
+ SkString getFunction; |
+ GrGLShaderVar getSatArgs[] = { GrGLShaderVar("color", kVec3f_GrSLType) }; |
+ SkString getSatBody; |
+ getSatBody.printf("return max(max(color.r, color.g), color.b) - " |
+ "min(min(color.r, color.g), color.b);"); |
+ fsBuilder->emitFunction(kFloat_GrSLType, |
+ "saturation", |
+ SK_ARRAY_COUNT(getSatArgs), getSatArgs, |
+ getSatBody.c_str(), |
+ &getFunction); |
+ |
+ // Emit a helper that sets the saturation given sorted input channels. This used |
+ // to use inout params for min, mid, and max components but that seems to cause |
+ // problems on PowerVR drivers. So instead it returns a vec3 where r, g ,b are the |
+ // adjusted min, mid, and max inputs, respectively. |
+ SkString helperFunction; |
+ GrGLShaderVar helperArgs[] = { |
+ GrGLShaderVar("minComp", kFloat_GrSLType), |
+ GrGLShaderVar("midComp", kFloat_GrSLType), |
+ GrGLShaderVar("maxComp", kFloat_GrSLType), |
+ GrGLShaderVar("sat", kFloat_GrSLType), |
+ }; |
+ static const char kHelperBody[] = "if (minComp < maxComp) {" |
+ "vec3 result;" |
+ "result.r = 0.0;" |
+ "result.g = sat * (midComp - minComp) / (maxComp - minComp);" |
+ "result.b = sat;" |
+ "return result;" |
+ "} else {" |
+ "return vec3(0, 0, 0);" |
+ "}"; |
+ fsBuilder->emitFunction(kVec3f_GrSLType, |
+ "set_saturation_helper", |
+ SK_ARRAY_COUNT(helperArgs), helperArgs, |
+ kHelperBody, |
+ &helperFunction); |
+ |
+ GrGLShaderVar setSatArgs[] = { |
+ GrGLShaderVar("hueLumColor", kVec3f_GrSLType), |
+ GrGLShaderVar("satColor", kVec3f_GrSLType), |
+ }; |
+ const char* helpFunc = helperFunction.c_str(); |
+ SkString setSatBody; |
+ setSatBody.appendf("float sat = %s(satColor);" |
+ "if (hueLumColor.r <= hueLumColor.g) {" |
+ "if (hueLumColor.g <= hueLumColor.b) {" |
+ "hueLumColor.rgb = %s(hueLumColor.r, hueLumColor.g, hueLumColor.b, sat);" |
+ "} else if (hueLumColor.r <= hueLumColor.b) {" |
+ "hueLumColor.rbg = %s(hueLumColor.r, hueLumColor.b, hueLumColor.g, sat);" |
+ "} else {" |
+ "hueLumColor.brg = %s(hueLumColor.b, hueLumColor.r, hueLumColor.g, sat);" |
+ "}" |
+ "} else if (hueLumColor.r <= hueLumColor.b) {" |
+ "hueLumColor.grb = %s(hueLumColor.g, hueLumColor.r, hueLumColor.b, sat);" |
+ "} else if (hueLumColor.g <= hueLumColor.b) {" |
+ "hueLumColor.gbr = %s(hueLumColor.g, hueLumColor.b, hueLumColor.r, sat);" |
+ "} else {" |
+ "hueLumColor.bgr = %s(hueLumColor.b, hueLumColor.g, hueLumColor.r, sat);" |
+ "}" |
+ "return hueLumColor;", |
+ getFunction.c_str(), helpFunc, helpFunc, helpFunc, helpFunc, |
+ helpFunc, helpFunc); |
+ fsBuilder->emitFunction(kVec3f_GrSLType, |
+ "set_saturation", |
+ SK_ARRAY_COUNT(setSatArgs), setSatArgs, |
+ setSatBody.c_str(), |
+ setSatFunction); |
+} |
+ |
+static void emit_advanced_xfermode_code(GrGLFragmentBuilder* fsBuilder, const char* srcColor, |
+ const char* dstColor, const char* outputColor, |
+ SkXfermode::Mode mode) { |
+ SkASSERT(srcColor); |
+ SkASSERT(dstColor); |
+ SkASSERT(outputColor); |
+ // These all perform src-over on the alpha channel. |
+ fsBuilder->codeAppendf("%s.a = %s.a + (1.0 - %s.a) * %s.a;", |
+ outputColor, srcColor, srcColor, dstColor); |
+ |
+ switch (mode) { |
+ case SkXfermode::kOverlay_Mode: |
+ // Overlay is Hard-Light with the src and dst reversed |
+ hard_light(fsBuilder, outputColor, dstColor, srcColor); |
+ break; |
+ case SkXfermode::kDarken_Mode: |
+ fsBuilder->codeAppendf("%s.rgb = min((1.0 - %s.a) * %s.rgb + %s.rgb, " |
+ "(1.0 - %s.a) * %s.rgb + %s.rgb);", |
+ outputColor, |
+ srcColor, dstColor, srcColor, |
+ dstColor, srcColor, dstColor); |
+ break; |
+ case SkXfermode::kLighten_Mode: |
+ fsBuilder->codeAppendf("%s.rgb = max((1.0 - %s.a) * %s.rgb + %s.rgb, " |
+ "(1.0 - %s.a) * %s.rgb + %s.rgb);", |
+ outputColor, |
+ srcColor, dstColor, srcColor, |
+ dstColor, srcColor, dstColor); |
+ break; |
+ case SkXfermode::kColorDodge_Mode: |
+ color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'r'); |
+ color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'g'); |
+ color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'b'); |
+ break; |
+ case SkXfermode::kColorBurn_Mode: |
+ color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'r'); |
+ color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'g'); |
+ color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'b'); |
+ break; |
+ case SkXfermode::kHardLight_Mode: |
+ hard_light(fsBuilder, outputColor, srcColor, dstColor); |
+ break; |
+ case SkXfermode::kSoftLight_Mode: |
+ fsBuilder->codeAppendf("if (0.0 == %s.a) {", dstColor); |
+ fsBuilder->codeAppendf("%s.rgba = %s;", outputColor, srcColor); |
+ fsBuilder->codeAppendf("} else {"); |
+ soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'r'); |
+ soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'g'); |
+ soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'b'); |
+ fsBuilder->codeAppendf("}"); |
+ break; |
+ case SkXfermode::kDifference_Mode: |
+ fsBuilder->codeAppendf("%s.rgb = %s.rgb + %s.rgb -" |
+ "2.0 * min(%s.rgb * %s.a, %s.rgb * %s.a);", |
+ outputColor, srcColor, dstColor, srcColor, dstColor, |
+ dstColor, srcColor); |
+ break; |
+ case SkXfermode::kExclusion_Mode: |
+ fsBuilder->codeAppendf("%s.rgb = %s.rgb + %s.rgb - " |
+ "2.0 * %s.rgb * %s.rgb;", |
+ outputColor, dstColor, srcColor, dstColor, srcColor); |
+ break; |
+ case SkXfermode::kMultiply_Mode: |
+ fsBuilder->codeAppendf("%s.rgb = (1.0 - %s.a) * %s.rgb + " |
+ "(1.0 - %s.a) * %s.rgb + " |
+ "%s.rgb * %s.rgb;", |
+ outputColor, srcColor, dstColor, dstColor, srcColor, |
+ srcColor, dstColor); |
+ break; |
+ case SkXfermode::kHue_Mode: { |
+ // SetLum(SetSat(S * Da, Sat(D * Sa)), Sa*Da, D*Sa) + (1 - Sa) * D + (1 - Da) * S |
+ SkString setSat, setLum; |
+ add_sat_function(fsBuilder, &setSat); |
+ add_lum_function(fsBuilder, &setLum); |
+ fsBuilder->codeAppendf("vec4 dstSrcAlpha = %s * %s.a;", |
+ dstColor, srcColor); |
+ fsBuilder->codeAppendf("%s.rgb = %s(%s(%s.rgb * %s.a, dstSrcAlpha.rgb)," |
+ "dstSrcAlpha.a, dstSrcAlpha.rgb);", |
+ outputColor, setLum.c_str(), setSat.c_str(), srcColor, |
+ dstColor); |
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;", |
+ outputColor, srcColor, dstColor, dstColor, srcColor); |
+ break; |
+ } |
+ case SkXfermode::kSaturation_Mode: { |
+ // SetLum(SetSat(D * Sa, Sat(S * Da)), Sa*Da, D*Sa)) + (1 - Sa) * D + (1 - Da) * S |
+ SkString setSat, setLum; |
+ add_sat_function(fsBuilder, &setSat); |
+ add_lum_function(fsBuilder, &setLum); |
+ fsBuilder->codeAppendf("vec4 dstSrcAlpha = %s * %s.a;", |
+ dstColor, srcColor); |
+ fsBuilder->codeAppendf("%s.rgb = %s(%s(dstSrcAlpha.rgb, %s.rgb * %s.a)," |
+ "dstSrcAlpha.a, dstSrcAlpha.rgb);", |
+ outputColor, setLum.c_str(), setSat.c_str(), srcColor, |
+ dstColor); |
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;", |
+ outputColor, srcColor, dstColor, dstColor, srcColor); |
+ break; |
+ } |
+ case SkXfermode::kColor_Mode: { |
+ // SetLum(S * Da, Sa* Da, D * Sa) + (1 - Sa) * D + (1 - Da) * S |
+ SkString setLum; |
+ add_lum_function(fsBuilder, &setLum); |
+ fsBuilder->codeAppendf("vec4 srcDstAlpha = %s * %s.a;", |
+ srcColor, dstColor); |
+ fsBuilder->codeAppendf("%s.rgb = %s(srcDstAlpha.rgb, srcDstAlpha.a, %s.rgb * %s.a);", |
+ outputColor, setLum.c_str(), dstColor, srcColor); |
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;", |
+ outputColor, srcColor, dstColor, dstColor, srcColor); |
+ break; |
+ } |
+ case SkXfermode::kLuminosity_Mode: { |
+ // SetLum(D * Sa, Sa* Da, S * Da) + (1 - Sa) * D + (1 - Da) * S |
+ SkString setLum; |
+ add_lum_function(fsBuilder, &setLum); |
+ fsBuilder->codeAppendf("vec4 srcDstAlpha = %s * %s.a;", |
+ srcColor, dstColor); |
+ fsBuilder->codeAppendf("%s.rgb = %s(%s.rgb * %s.a, srcDstAlpha.a, srcDstAlpha.rgb);", |
+ outputColor, setLum.c_str(), dstColor, srcColor); |
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;", |
+ outputColor, srcColor, dstColor, dstColor, srcColor); |
+ break; |
+ } |
+ default: |
+ SkFAIL("Unknown Custom Xfer mode."); |
+ break; |
+ } |
+} |
+ |
+////////////////////////////////////////////////////////////////////////////// |
+// Porter-Duff blend helper |
+////////////////////////////////////////////////////////////////////////////// |
+ |
+static bool append_porterduff_term(GrGLFragmentBuilder* fsBuilder, SkXfermode::Coeff coeff, |
+ const char* colorName, const char* srcColorName, |
+ const char* dstColorName, bool hasPrevious) { |
+ if (SkXfermode::kZero_Coeff == coeff) { |
+ return hasPrevious; |
+ } else { |
+ if (hasPrevious) { |
+ fsBuilder->codeAppend(" + "); |
+ } |
+ fsBuilder->codeAppendf("%s", colorName); |
+ switch (coeff) { |
+ case SkXfermode::kOne_Coeff: |
+ break; |
+ case SkXfermode::kSC_Coeff: |
+ fsBuilder->codeAppendf(" * %s", srcColorName); |
+ break; |
+ case SkXfermode::kISC_Coeff: |
+ fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", srcColorName); |
+ break; |
+ case SkXfermode::kDC_Coeff: |
+ fsBuilder->codeAppendf(" * %s", dstColorName); |
+ break; |
+ case SkXfermode::kIDC_Coeff: |
+ fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", dstColorName); |
+ break; |
+ case SkXfermode::kSA_Coeff: |
+ fsBuilder->codeAppendf(" * %s.a", srcColorName); |
+ break; |
+ case SkXfermode::kISA_Coeff: |
+ fsBuilder->codeAppendf(" * (1.0 - %s.a)", srcColorName); |
+ break; |
+ case SkXfermode::kDA_Coeff: |
+ fsBuilder->codeAppendf(" * %s.a", dstColorName); |
+ break; |
+ case SkXfermode::kIDA_Coeff: |
+ fsBuilder->codeAppendf(" * (1.0 - %s.a)", dstColorName); |
+ break; |
+ default: |
+ SkFAIL("Unsupported Blend Coeff"); |
+ } |
+ return true; |
+ } |
+} |
+ |
+////////////////////////////////////////////////////////////////////////////// |
+ |
+void GrGLSLBlend::AppendMode(GrGLFragmentBuilder* fsBuilder, const char* srcColor, |
+ const char* dstColor, const char* outColor, |
+ SkXfermode::Mode mode) { |
+ |
+ SkXfermode::Coeff srcCoeff, dstCoeff; |
+ if (SkXfermode::ModeAsCoeff(mode, &srcCoeff, &dstCoeff)) { |
+ fsBuilder->codeAppendf("%s = ", outColor); |
+ // append src blend |
+ bool didAppend = append_porterduff_term(fsBuilder, srcCoeff, srcColor, srcColor, dstColor, |
+ false); |
+ // append dst blend |
+ if(!append_porterduff_term(fsBuilder, dstCoeff, dstColor, srcColor, dstColor, didAppend)) { |
+ fsBuilder->codeAppend("vec4(0, 0, 0, 0)"); |
+ } |
+ fsBuilder->codeAppend(";"); |
+ } else { |
+ emit_advanced_xfermode_code(fsBuilder, srcColor, dstColor, outColor, mode); |
+ } |
+} |